Observed trends and teleconnections of the Siberian high: A recently declining center of action
This study investigates variability in the intensity of the wintertime Siberian high (SH) by defining a robust SH index (SHI) and correlating it with selected meteorological fields and teleconnection indices. A dramatic trend of -2.5 hPa decade(-1) has been found in the SHI between 1978 and 2001 wit...
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ftunivreading:oai:centaur.reading.ac.uk:3951 2024-09-15T18:17:35+00:00 Observed trends and teleconnections of the Siberian high: A recently declining center of action Panagiotopoulos, F. Shahgedanova, M. Hannachi, Abdelwaheb Ben Ahmed Stephenson, D. B. 2005 https://centaur.reading.ac.uk/3951/ unknown American Meteorological Society Panagiotopoulos, F., Shahgedanova, M. <https://centaur.reading.ac.uk/view/creators/90000204.html> orcid:0000-0002-2320-3885 , Hannachi, A. B. A. <https://centaur.reading.ac.uk/view/creators/90002773.html> and Stephenson, D. B. (2005) Observed trends and teleconnections of the Siberian high: A recently declining center of action. Journal of Climate, 18 (9). pp. 1411-1422. ISSN 1520-0442 doi: https://doi.org/10.1175/JCLI3352.1 <https://doi.org/10.1175/JCLI3352.1> Article NonPeerReviewed 2005 ftunivreading https://doi.org/10.1175/JCLI3352.1 2024-07-30T14:08:25Z This study investigates variability in the intensity of the wintertime Siberian high (SH) by defining a robust SH index (SHI) and correlating it with selected meteorological fields and teleconnection indices. A dramatic trend of -2.5 hPa decade(-1) has been found in the SHI between 1978 and 2001 with unprecedented (since 1871) low values of the SHI. The weakening of the SH has been confirmed by analyzing different historical gridded analyses and individual station observations of sea level pressure (SLP) and excluding possible effects from the conversion of surface pressure to SLP. SHI correlation maps with various meteorological fields show that SH impacts on circulation and temperature patterns extend far outside the SH source area extending from the Arctic to the tropical Pacific. Advection of warm air from eastern Europe has been identified as the main mechanism causing milder than normal conditions over the Kara and Laptev Seas in association with a strong SH. Despite the strong impacts of the variability in the SH on climatic variability across the Northern Hemisphere, correlations between the SHI and the main teleconnection indices of the Northern Hemisphere are weak. Regression analysis has shown that teleconnection indices are not able to reproduce the interannual variability and trends in the SH. The inclusion of regional surface temperature in the regression model provides closer agreement between the original and reconstructed SHI. Article in Journal/Newspaper laptev CentAUR: Central Archive at the University of Reading Journal of Climate 18 9 1411 1422 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
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unknown |
description |
This study investigates variability in the intensity of the wintertime Siberian high (SH) by defining a robust SH index (SHI) and correlating it with selected meteorological fields and teleconnection indices. A dramatic trend of -2.5 hPa decade(-1) has been found in the SHI between 1978 and 2001 with unprecedented (since 1871) low values of the SHI. The weakening of the SH has been confirmed by analyzing different historical gridded analyses and individual station observations of sea level pressure (SLP) and excluding possible effects from the conversion of surface pressure to SLP. SHI correlation maps with various meteorological fields show that SH impacts on circulation and temperature patterns extend far outside the SH source area extending from the Arctic to the tropical Pacific. Advection of warm air from eastern Europe has been identified as the main mechanism causing milder than normal conditions over the Kara and Laptev Seas in association with a strong SH. Despite the strong impacts of the variability in the SH on climatic variability across the Northern Hemisphere, correlations between the SHI and the main teleconnection indices of the Northern Hemisphere are weak. Regression analysis has shown that teleconnection indices are not able to reproduce the interannual variability and trends in the SH. The inclusion of regional surface temperature in the regression model provides closer agreement between the original and reconstructed SHI. |
format |
Article in Journal/Newspaper |
author |
Panagiotopoulos, F. Shahgedanova, M. Hannachi, Abdelwaheb Ben Ahmed Stephenson, D. B. |
spellingShingle |
Panagiotopoulos, F. Shahgedanova, M. Hannachi, Abdelwaheb Ben Ahmed Stephenson, D. B. Observed trends and teleconnections of the Siberian high: A recently declining center of action |
author_facet |
Panagiotopoulos, F. Shahgedanova, M. Hannachi, Abdelwaheb Ben Ahmed Stephenson, D. B. |
author_sort |
Panagiotopoulos, F. |
title |
Observed trends and teleconnections of the Siberian high: A recently declining center of action |
title_short |
Observed trends and teleconnections of the Siberian high: A recently declining center of action |
title_full |
Observed trends and teleconnections of the Siberian high: A recently declining center of action |
title_fullStr |
Observed trends and teleconnections of the Siberian high: A recently declining center of action |
title_full_unstemmed |
Observed trends and teleconnections of the Siberian high: A recently declining center of action |
title_sort |
observed trends and teleconnections of the siberian high: a recently declining center of action |
publisher |
American Meteorological Society |
publishDate |
2005 |
url |
https://centaur.reading.ac.uk/3951/ |
genre |
laptev |
genre_facet |
laptev |
op_relation |
Panagiotopoulos, F., Shahgedanova, M. <https://centaur.reading.ac.uk/view/creators/90000204.html> orcid:0000-0002-2320-3885 , Hannachi, A. B. A. <https://centaur.reading.ac.uk/view/creators/90002773.html> and Stephenson, D. B. (2005) Observed trends and teleconnections of the Siberian high: A recently declining center of action. Journal of Climate, 18 (9). pp. 1411-1422. ISSN 1520-0442 doi: https://doi.org/10.1175/JCLI3352.1 <https://doi.org/10.1175/JCLI3352.1> |
op_doi |
https://doi.org/10.1175/JCLI3352.1 |
container_title |
Journal of Climate |
container_volume |
18 |
container_issue |
9 |
container_start_page |
1411 |
op_container_end_page |
1422 |
_version_ |
1810455639061692416 |